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Dynamic voltage-sharing simulation test method for multi-break high-voltage direct-current fast mechanical switch

A high-voltage direct current, mechanical switch technology, applied in the direction of circuit breaker testing, instruments, measuring devices, etc., can solve problems such as uneven voltage distribution, achieve good voltage equalization effect, reduce test cost, and high reliability

Active Publication Date: 2018-11-30
WUHAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a dynamic voltage equalization simulation test method for a multi-fracture high-voltage direct current fast mechanical switch, which is used to solve the problem of uneven voltage distribution between fractures of a multi-fracture high-voltage direct current fast mechanical switch

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  • Dynamic voltage-sharing simulation test method for multi-break high-voltage direct-current fast mechanical switch
  • Dynamic voltage-sharing simulation test method for multi-break high-voltage direct-current fast mechanical switch
  • Dynamic voltage-sharing simulation test method for multi-break high-voltage direct-current fast mechanical switch

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Embodiment Construction

[0025] The specific embodiment of the present invention is described in detail below:

[0026] One, at first introduce method step of the present invention

[0027] (1) According to the operation time of multi-fracture high-voltage direct current fast mechanical switch, breaking time, rated opening distance, etc., determine the maximum stroke difference during the action process of each fracture movable contact;

[0028] (2) Calculate the partial pressure ratio and distributed capacitance of each fracture when the moving contact of each fracture is at different positions between the safe distance and the rated opening distance, and establish the equivalent resistance-capacitance network of the multi-fracture high-voltage DC fast mechanical switch;

[0029] (3) Calculate the pressure equalization resistance capacitance parameters of each fracture;

[0030] (4) During the field test, according to the position of the moving contact when the partial pressure ratio of each fractur...

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Abstract

The invention relates to a dynamic voltage-sharing simulation test method for a multi-break high-voltage direct-current fast mechanical switch. The dynamic voltage-sharing simulation test method is used for solving the problem of multi-break series-connection dynamic voltage sharing of the direct-current fast mechanical switch. The dynamic voltage-sharing simulation test method comprises the following steps that (1) the maximum stroke difference of moving contact actions of all breaks is determined; (2) a switch equivalent resistance-capacitance network is established; (3) voltage-sharing resistance-capacitance parameters of all the breaks are calculated; (4) a voltage-sharing test is conducted; (5) a voltage division ratio test is conducted; and (6) the optimum voltage-sharing resistance-capacitance parameter is determined. The dynamic voltage-sharing simulation test method for the multi-break high-voltage direct-current fast mechanical switch can equivalently solve the problem that it is difficult to adjust different periods by adopting a quick operating mechanism during an actual real-type test, the testing cost is lowered, and the testing efficiency is improved.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current transmission, and in particular relates to a voltage equalization simulation test method of a multi-fracture high-voltage direct current fast mechanical switch. Background technique [0002] Due to the weak overcurrent and overvoltage capabilities of power electronic equipment in flexible DC; at the same time, the low impedance characteristics of the DC side make the short-circuit fault current increase rate relatively large, and the flexible DC has higher requirements for quick action and selectivity in protection than ordinary AC. higher. The AC circuit breaker on the AC side of the converter is used to cut off the fault current, but the fault clearing time is longer; or the short-circuit current is cut off by the converter with its own current cut-off capability, and the result is a short-circuit fault on any DC line. All converters in the system will be blocked and the system will b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
CPCG01R31/3271
Inventor 黄道春杨秋玉阮江军邱志斌王学宗李冠南
Owner WUHAN UNIV
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